3500 m高海拔长服役寿命混凝土的配制

Preparation of long service life concrete at 3 500 meters high altitude

气泡的产生与稳定性受控于液相表面张力的大小、气泡的液膜强度、气体的透过性以及液膜的静电作用等。表面张力是影响表面活性剂引气能力的关键指标,而增稠剂可有效改善高海拔地区引气混凝土的引气效果。利用界面化学理论,能够系统地分析、解决混凝土气泡问题。

The generation and stability of bubbles are controlled by the surface tension of liquid phase,the strength of liquid film of bubbles,the permeability of gas and the electrostatic action of liquid film.Surface tension is a key index affecting the air entrainment ability of surfactants,and thickening agent can effectively improve the air entrainment effect of air-entrainment concrete in high altitude areas.Using the theory of interface chemistry,the problem of concrete surface bubbles can be analyzed and solved systematically.